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STM32F103 Timer Interrupt Issue

Question asked by Praveen Gonsalves on Sep 7, 2017
Latest reply on May 1, 2018 by waclawek.jan



I'm using STM32F103RBT6 for my project, I've designed a custom board. 

I'm using cubemx to generate the basic code and Atollic for debugging.

I'm reading the switches using external interrupt. In the external interrupt call back, I'm starting a timer. 

In the timer interrupt handler, I'm doing some work. 

I've kept the timer timeout period to 2 seconds. 

My problem is whenever the code is started to run for the first time and when I press the switch, the code immediately  goes to the timer interrupt handler. This happens only once for the first time. After this, whenever I press the switch, code goes to the timer interrupt in 2 seconds which is correct. 

Why does it go immediately goes to the interrupt handler for the first time and then works fine thereafter??

I've attached the c file for reference. 

Is there any changes to be made??

Please suggest.